WO2005047130A1 - Decorative band, food packaging comprising one such band and production method thereof - Google Patents

Decorative band, food packaging comprising one such band and production method thereof Download PDF

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Publication number
WO2005047130A1
WO2005047130A1 PCT/FR2004/002698 FR2004002698W WO2005047130A1 WO 2005047130 A1 WO2005047130 A1 WO 2005047130A1 FR 2004002698 W FR2004002698 W FR 2004002698W WO 2005047130 A1 WO2005047130 A1 WO 2005047130A1
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WO
WIPO (PCT)
Prior art keywords
streamers
streamer
cutting
edge
strip
Prior art date
Application number
PCT/FR2004/002698
Other languages
French (fr)
Inventor
Jakob Socher
Original Assignee
Compagnie Gervais Danone
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Compagnie Gervais Danone filed Critical Compagnie Gervais Danone
Priority to EP04805262A priority Critical patent/EP1680331B1/en
Priority to PL04805262T priority patent/PL1680331T3/en
Priority to DE602004016546T priority patent/DE602004016546D1/en
Priority to US10/577,724 priority patent/US20070134381A1/en
Priority to DK04805262T priority patent/DK1680331T3/en
Priority to SI200430898T priority patent/SI1680331T1/en
Publication of WO2005047130A1 publication Critical patent/WO2005047130A1/en
Priority to US14/300,252 priority patent/US20140284240A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D25/00—Details of other kinds or types of rigid or semi-rigid containers
    • B65D25/20—External fittings
    • B65D25/205—Means for the attachment of labels, cards, coupons or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D5/00—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper
    • B65D5/42—Details of containers or of foldable or erectable container blanks
    • B65D5/4212—Information or decoration elements, e.g. content indicators, or for mailing
    • B65D5/4216—Cards, coupons or the like formed integrally with, or printed directly on, the container or lid
    • B65D5/4229—Cards, coupons or the like formed integrally with, or printed directly on, the container or lid in the form of a detachable panel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D25/00—Details of other kinds or types of rigid or semi-rigid containers
    • B65D25/34—Coverings or external coatings
    • B65D25/36—Coverings or external coatings formed by applying sheet material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2301/00—Details of blanks
    • B65D2301/10—Blanks mutually positioned to minimise waste material upon cutting out the individual blank from a continuous or large sheet

Definitions

  • the present invention relates to a decorative streamer intended to surround the periphery of a food package.
  • the package comprises a lateral annular wall extending between a bottom and an upper face, while the streamer extends longitudinally between two ends and has a first and a second longitudinal edge.
  • This type of banner generally includes a logo representing the brand of the product, and possibly an image evoking the content and indications on the composition of the product.
  • These streamers are intended to surround the periphery of the side wall of the package so that the ends of the streamer overlap, or they come edge to edge.
  • Decorative streamers are very commonly used for packages containing dairy products, for example yogurt or butter, but also products such as fruit compotes and margarine.
  • the upper face of the package is provided with an opening that can be closed by a tear-off lid in the case of yoghurt-type packaging, or by a removable lid as is most often used for packaging intended to contain margarine.
  • the pot which forms the bottom, the side wall, and possibly part of the upper face of the package, is generally made by thermoforming a sheet of plastic material in a mold.
  • the decorative streamers have an elongated rectangular shape, that is to say that they have first and second longitudinal edges rectilinear and parallel. They are usually cut from a strip of film material such as paper or plastic film, which is printed and stored as a roll before the streamers are cut. Food packaging of this type is produced in very large quantities and intended for highly competitive markets. It is therefore important to minimize the unit cost of each package without degrading its strength and aesthetic characteristics.
  • the present invention therefore aims to reduce the unit cost of these packages dressed with a decorative streamer.
  • the decorative streamer of the aforementioned type is characterized in that it has at least a first longitudinally extending portion having a maximum width, and at least a second portion having a minimum width, said minimum width being at least plus two-thirds of the maximum width.
  • the streamer thus produced can still completely surround the package to maintain a good quality of attachment thereof, and be used in the present application processes of the banner on the packaging used.
  • the first longitudinal edge is rectilinear and substantially parallel to the longitudinal axis of the streamer, this first straight edge then allowing to guide the streamer in commonly used routing devices and without significant modification thereof;
  • the second edge has a convex profile along the first portion and a concave profile along the second portion, said convex profile being complementary to said concave profile, to produce in a film material the second edges of a first and a second streamer by performing a single line of cut;
  • the second edge has the profile of a continuous wavy line;
  • the minimum width is at least one third of the maximum width, to maintain a tensile strength that prevents the breaking of the banner during its routing during the manufacturing cycle;
  • the maximum width is substantially equal to the maximum height of the side wall of the package food.
  • the streamer defined above can be made from a strip of film material having patterns which define, in the width of the strip, the contour of an even number of rows of said streamers which are arranged so that the second edges of the streamers of two successive rows are adjacent, and so that the first edge of the first row and the first edge of the last row are contiguous to the longitudinal edges of the band, so as to have no drop in the band after cutting the streamers.
  • a food package having a lateral annular wall extending between a bottom and an upper face, is advantageously surrounded on the periphery of the side wall by a decorative streamer as defined above, in order to reduce the overall cost of this package.
  • the first portion of maximum width of the streamer is arranged on a large side of the side wall of packaging, so that this portion of the streamer is clearly visible.
  • a method of manufacturing the streamer defined above which comprises a step of cutting the longitudinal edges of the streamers
  • at least the cutting of the streamer second edge of the streamers is performed by a device comprising at least one mobile laser beam which makes it possible to produce varied and relatively complex cutting lines
  • the cutting of the longitudinal edges of the streamers is carried out in a band of pellicular material as defined above, which passes by relative to the laser cutting device, the movements of the laser beam being synchronized with the scrolling of the strip.
  • FIG. 1 is a front view of a first embodiment. embodiment of a streamer according to the invention
  • FIG. 2 is a view similar to FIG. 1 of a second embodiment of a streamer according to the invention
  • FIG. 3 is a diagrammatic view of a strip of pelli-cular material from which streamers according to the invention can be cut;
  • Figures 4 and 5 are respectively a front view and a side view of a food package surrounded by a streamer according to the invention;
  • FIG. 6 is a partial schematic view of a production line of the packages represented in FIGS. 4 and 5.
  • Figure 1 there is shown a decorative streamer intended to surround the periphery of a package food.
  • the streamer 1 is made of a film material, that is to say thin and flexible, such as paper or a plastic film, in particular a thermoplastic material such as polypropylene.
  • the choice of a particular material is determined, among other things, according to the conditions of use of the packaging and according to the method of attachment of the streamer to the package. Fixing may in particular be carried out by total or partial sizing of the streamer, or by welding in the case where it is fixed during thermoforming of the pot of the package.
  • the streamer extends longitudinally along a length 1 between ends 2.
  • the length 1 is determined according to the perimeter of the package for which the streamer is intended. This length can be exactly equal to the perimeter so that the ends 2 come edge to edge, or slightly greater than the perimeter to have an overlap of the ends.
  • the streamer is delimited by a first longitudinal edge 3 and a second longitudinal edge 4.
  • the streamer 1 has different contiguous portions which extend along the longitudinal axis of the streamer.
  • these portions comprise two first portions 10 and 11 which have a maximum width L1.
  • Portions 10 and 11 are also referred to as maximum width portions thereafter.
  • the streamer also comprises two second portions 20 and 21 interposed between the first portions 10 and 11, which have a minimum width L2, also called reduced width portion thereafter.
  • the minimum width L2 or the maximum width L1 can be reached over a whole segment (12,22) of the corresponding portion, as shown in the embodiment shown in FIG. 1, or only in one point (12,22) of each portion as shown in the embodiment in Figure 2.
  • the streamers shown in Figures 1 and 2 have two portions of maximum width (10, 11) and two portions of reduced width (20, 21), but the number of portions could be different. In particular, it is possible to provide a single portion of maximum width and a single portion of reduced width.
  • the minimum width L2 must be substantially smaller than the maximum width L1; in fact, the portions of reduced width (20, 21) must make it possible to reduce the total area of the streamer relative to the streamers usually used, which have a rectangular shape of width L1 and length 1. This reduction in the area of the streamer causes of course a reduction in the film material used, and therefore a reduction in the cost of the streamer.
  • the minimum width L2 shall be not more than two-thirds of the maximum width L1.
  • the ratio between the maximum and minimum widths (L1, L2) may vary depending on the extent of the segments or points (12, 22) over which the maximum and minimum width is reached, and depending on the economy that is sought to achieve.
  • the streamer has several portions of reduced width (20, 21) it is not absolutely necessary that they all reach the same minimum width L2. It is the same for the portions of maximum width (10, 11).
  • the average width of the second portions (20, 21) must be less than the average width of the first portions (10, 11). It will be noted that the retention of portions of maximum width (10, 11) allows the printing on the banner of logos and images of significant size, and preferably of size equal to those used to date, which are clearly visible by the consumer.
  • the streamer made according to the invention retains its role of information vis-à-vis consumers.
  • the maximum width L1 is substantially equal to the maximum height H of the side wall of the food package which will be detailed below.
  • the first longitudinal edge 3 of the streamer is rectilinear and parallel to the longitudinal axis thereof.
  • the rectilinear edge 3 facilitates the guidance of the streamers during their routing and facilitates their correct placement relative to the pots during the wrapping operation.
  • the second longitudinal edge 4 is formed of longitudinal segments (12, 22) connected by inclined segments, so that the second edge 4 has the profile of a broken line.
  • the second edge 4 can have the profile of a continuous corrugated line, as can be seen in FIG. 2. This arrangement facilitates the cutting of the second edges of the streamer, which is made using rotary knives or with a laser device detailed below.
  • the profile of the second edge 4 may be a sinusoidal wavy line, but it is possible to accentuate or reduce the amplitude of the corrugations, or not to center them on the portions of maximum or reduced width, the exact profile of the corrugated line. which can be determined for aesthetic reasons.
  • the second edge 4 of the streamer has a convex profile whose apex is defined by the segment or the point 12. While along the portions of reduced width (20, 21), the edge of the second edge 4 of the streamer has a concave profile whose maximum hollow is reached at the segment or point 22. As is more clearly apparent in FIG.
  • the convex profiles of the portions of maximum width (10, 11) are complementary to the concave profiles of the reduced width portions (20, 21).
  • the portion of reduced width 20 comprises the ends 2 of the streamer, which allows to place the area of cover or abutment ends in a less visible area of the package.
  • the portion 20 has a concave profile complementary to the convex profile portions of maximum width 10 or 11.
  • the minimum width L2 can be greatly reduced compared to the maximum width L1 in order to achieve a significant saving of pellicular material.
  • the minimum width L2 is at least equal to one third of the maximum width L1.
  • the maximum width L1 is 36 mm and the minimum width L2 is 18 mm, ie half of L2, for the embodiment of FIG.
  • the streamers shown in FIGS. 1 and 2 may be cut out of a strip of film material 6 as shown in FIG. 3.
  • the strip of film material 6 has patterns 7 which may cover the strip more or less completely. These patterns define the outline of the streamers that will be cut out in this band. These contours are represented symbolically by continuous lines in FIG. 3, but these are not cutting lines or pre-cuts previously made on the strip 6.
  • the printed patterns 7 are printed on the strip 6 of FIG.
  • FIGs 4 and 5 there is shown a food packaging 40 yogurt pot type which is surrounded by a streamer 1 made according to the invention.
  • the package 40 comprises a pot 41 closed by a tear-off operculum.
  • the pot 41 of thermoplastic material is produced according to a known thermoforming process, and as for example described in document FR-A-2 759 320, which consists of preheating a sheet of thermoplastic material and then stamping it into molds, a streamer being previously positioned against the side wall of said molds.
  • this operation of forming the pot is generally followed by a filling operation with the food product, immediately followed by a closure operation by a lid.
  • This process is carried out by an FFS production machine for Forming, Filling, Closing (Form, Fill, Seal).
  • This type of packaging 40 for which is intended the streamer has a capacity generally between 10 and 500 ml, and for example about 200 ml as in the embodiment shown.
  • the pot 41 has a bottom 43 which, in the embodiment shown, rises quite widely towards the side wall 44. But of course, the pot could have a cylindrical shape, and in this case, the bottom 43 would be formed solely by the lower disk of the cylinder.
  • the side wall 44 is annular and extends vertically to a radially outer collar that surrounds the opening of the pot. A cap is fitted on the neck of the pot so as to form the upper face 42 of the package.
  • the cross section of the package has generally the shape of a rectangle with rounded corners.
  • the side wall 44 has a maximum height H in the center of the long side of the package. But in the case of a cylindrical pot, the height H of the package would be equal to the cylinder height.
  • the portion of maximum width 10 of the streamer 1 is arranged on the long side of the package, as can be seen in FIG.
  • the maximum width L 2 is substantially equal to the height H.
  • the pattern 7 of the banner is large enough to retain the role of information and decoration of the banner.
  • the width L1 of the streamer may be a few millimeters lower than the height H of the pot while maintaining the visual qualities of the streamer; for example, in the embodiment shown, the height H is 38 mm and the width L2 is 36 mm.
  • a laser device comprising a mobile laser beam whose movements are controlled so as to follow the concave and convex profiles of this second edge.
  • the laser can be of all types known and adapted to cut a sheet of paper or a plastic film.
  • the laser device can produce a beam, or several clipping beams as in the case of the device 50 shown in Figure 6.
  • the movements of the beam or beams are created by servomotors acting for example on mirrors.
  • the servomotors are themselves controlled by a device of control 51 which contains one or more servo servo programs so that the laser beams perform one or more cutting lines.
  • a laser device thus makes it possible to cut the second longitudinal edge 4 of the streamers in a complex pattern and offers the possibility of passing almost instantaneously from the production of a first form of streamer to a second form of streamer, simply by addition of a code in the control device 51.
  • a laser device has the advantage over a device with rotating knives or cutting dies, not to undergo wear phenomena, or phenomena of fouling, which is particularly important in the field of food packaging.
  • the rectilinear edges can also be cut by a laser beam.
  • the cutting of the streamers by the laser cutting device is preferably carried out in a strip of film material as described above.
  • the strip 6, stored in the form of a roll is unwound so as to scroll relative to the laser cutting device 50 disposed transversely relative to the direction of travel. Due to this movement of the strip 6 relative to the device 50, it is possible to control the displacement of the beams only in a direction transverse to the strip, which avoids having to control an additional movement in the longitudinal direction of the banners.
  • a device 52 adapted to detect the movement of the strip 6 is connected to the control device 51 in order to synchronize the movements of the laser beams with the scrolling of the strip.
  • the device 52 may be an optical recognition device for the printed patterns on the tape or any other marking affixed to it.
  • the cutting of the strips is integrated in the machine for manufacturing the packaging pots 41.
  • thermoforming station which comprises molds represented symbolically by the reference 55.
  • the step cutting of the longitudinal edges is followed by a step of routing the strips 31, 36 corresponding to the rows of the strip 6 which have been cut longitudinally.
  • This routing step is performed using pulleys and references 57 of known types, and does not require significant changes with the first straight edge 3 which facilitates the guiding of the strips. It will be noted that during the routing of the streamers, the even rows (32, 34, 36) undergo reverse rotation relative to the odd rows (31, 33, 35) to arrive at the molding stations with the same vertical orientation .
  • the streamers are introduced into them before thermoforming the pots and cut transversely using a cutting knife system known to form the ends of the streamers.
  • a cutting knife system known to form the ends of the streamers.
  • it is a machine for making six pots simultaneously, but of course, it could be a machine to achieve twelve or twenty-four pots at a time.

Abstract

The invention relates to a decorative band which is designed to surround the periphery of food packaging (40) comprising a lateral annular wall (44) which extends between a base (43) and an upper face (42). According to the invention, the band extends longitudinally between two ends and is equipped with first and second longitudinal edges. Moreover, the inventive band (1) comprises at least one first longitudinal portion (10) having a maximum width and at least one second portion having a minimum width, said minimum width being at most equal to two thirds of the maximum width. The invention also relates to packaging which is equipped with one such band, to a method of cutting the band and to a method of producing the packaging.

Description

BANDEROLE DECORATIVE, EMBALLAGE ALIMENTAIRE COMPRENANT UNE TELLE BANDEROLE ET PROCEDE DE FABRICATION La présente invention se rapporte à une banderole décorative destinée à entourer la périphérie d'un emballage alimentaire. Plus particulièrement, l'emballage comprend une paroi annulaire latérale s'étendant entre un fond et une face supérieure, tandis que la banderole s'étend longitudinalement entre deux extrémités et présente un premier et un deuxième bords longitudinaux. Ce type de banderole comporte généralement un logo représentant la marque du produit, et éventuellement une image évoquant le contenu et des indications sur la composition du produit. Ces banderoles sont destinées à entourer la périphérie de la paroi latérale de l'emballage de sorte que les extrémités de la banderole se recouvrent, ou qu'elles viennent bord à bord. Le fait que la banderole entoure complètement l'emballage répond à des critères esthétiques, mais améliore aussi la tenue de la banderole sur l'emballage par rapport aux étiquettes, et évite son arrachage. Les banderoles décoratives sont très coura rnenc employées pour des emballages contenant des produits laitiers, comme par exemple les yaourts ou le beurre, mais aussi des produits comme les compotes de fruits, la margarine. La face supérieure de l'emballage est munie d'une ouverture qui peut être fermée par un opercule arrachable dans le cas des emballages de type pot de yaourt, ou par un couvercle amovible comme cela est le plus souvent utilisé pour les emballages destinés à contenir de la margarine. Le pot qui forme le fond, la paroi latérale, et éventuellement une partie de la face supérieure de l'emballage, est généralement réalisée par thermoformage d'une feuille en matière plastique dans un moule. Ce procédé de fabrication permet de produire des emballages particulièrement peu onéreux en très grande quantité tout en respectant les normes d'hygiène nécessaires pour les produits alimentaires. A ce jour, les banderoles décoratives ont une forme rectangulaire allongée, c'est-à-dire qu'elles présentent des premier et deuxième bords longitudinaux rectilignes et parallèles. Elles sont généralement découpées à partir d'une bande de matériau pelliculaire comme le papier ou un film de matière plastique, qui est imprimée et stockée sous forme de rouleau avant la découpe des banderoles. Les emballages alimentaires de ce type sont produits en très grande quantité et destinés à des marchés fortement concurrentiels. Il est par conséquent important de réduire le plus possible le coût unitaire de chaque emballage sans toutefois dégrader sa résistance et ses caractéristiques esthétiques. La présente invention vise donc à réduire le coût unitaire de ces emballages habillés d'une banderole décorative. A cet effet, la banderole décorative du type précité est caractérisée en ce qu'elle présente au moins une première portion s'étendant longitudinalement qui présente une largeur maximale, et au moins une deuxième portion qui présente une largeur minimale, ladite largeur minimale étant au plus égale aux deux tiers de la largeur maximale. Grâce à cette disposition, la quantité de matière pelliculaire, qu'il s'agisse de papier ou de film plastique, utilisée pour réaliser la banderole est moins importante que celle utilisée pour réaliser une banderole rectangulaire présentant une largeur égale à la largeur maximale, réduction de matière qui permet bien entendu de réduire le coût de la banderole. Cette réduction de matière permet également de diminuer le poids de l'emballage, ce qui a une influence favorable sur le transport et le recyclage des emballages. Le fait que la surface de la banderole soit réduite permet également de réduire la surface des décors imprimés et par conséquent, de réaliser des économies d'encre. Par ailleurs, la banderole ainsi réalisée peut toujours entourer complètement l'emballage pour conserver une bonne qualité de fixation de celle-ci, et être utilisée dans les procédés d'application de la banderole sur l'emballage utilisés actuellement. Dans des modes de réalisation préférés de la banderole, on peut avoir recours en outre à l'une et/ou à l'autre des dispositions suivantes : - le premier bord longitudinal est rectiligne et sensiblement parallèle à l'axe longitudinal de la banderole, ce premier bord rectiligne permettant alors de guider la banderole dans les dispositifs d'acheminement couramment utilisés et sans modification importante de ceux-ci ; le deuxième bord présente un profil convexe le long de la première portion et un profil concave le long de la deuxième portion, ledit profil convexe étant complémentaire au dit profil concave, afin de réaliser dans un matériau pelliculaire les deuxièmes bords d'une première et d'une deuxième banderoles en effectuant une seule ligne de coupe ; le deuxième bord a le profil d'une ligne ondulée continue ; - la largeur minimale est au moins égale à un tiers de la largeur maximale, pour conserver une résistance à la traction qui évite la rupture de la banderole lors de son acheminement au cours du cycle de fabrication ; la largeur maximale est sensiblement égale à la hauteur maximale de la paroi latérale de l'emballage alimentaire. La banderole définie ci-dessus peut être réalisée à partir d'une bande de matière pelliculaire comportant des motifs qui définissent, dans le sens de la largeur de la bande, le contour d'un nombre pair de rangées desdites banderoles qui sont agencées de sorte que les deuxièmes bords des banderoles de deux rangées successives soient adjacents, et de sorte que le premier bord de la première rangée et le premier bord de la dernière rangée soient contigus aux bords longitudinaux de la bande, afin de n'avoir aucune chute dans la bande après le découpage des banderoles . Un emballage alimentaire présentant une paroi annulaire latérale s'étendant entre un fond et une face supérieure, est avantageusement entouré sur la périphérie de la paroi latérale par une banderole décorative telle que définie précédemment, afin de réduire le coût global de cet emballage. Dans le cas où la paroi latérale annulaire d'un tel emballage a une section transversale qui présente globalement la forme d'un rectangle à coins arrondis, la première portion de largeur maximale de la banderole est agencée sur un grand côté de la paroi latérale de l'emballage, afin que cette portion de la banderole soit bien visible. Dans un procédé de fabrication de la banderole définie ci-dessus, qui comprend une étape de découpage des bords longitudinaux des banderoles, on peut avoir recours à l'une et/ou à l'autre des dispositions suivantes : - au moins le découpage du deuxième bord des banderoles est effectué par un dispositif comprenant au moins un faisceau laser mobile qui permet de réaliser des tracés de découpe variés et relativement complexes ; le découpage des bords longitudinaux des banderoles est effectué dans une bande de matière pelliculaire telle que définie précédemment qui défile par rapport au dispositif de découpage laser, les mouvements du faisceau laser étant synchronisés avec le défilement de la bande . Dans un procédé de fabrication d'emballage muni d'une banderole selon l'invention, et qui comprend une étape de thermoformage des emballages dans des moules, il est avantageux d'inclure une étape de découpage des bords longitudinaux à partir d'une bande telle que définie précédemment, suivie d'une étape d'amenée des bandelettes ainsi obtenues jusqu'au moule, et d'une étape de découpage des extrémités des banderoles qui est effectuée à proximité des moules. D'autres caractéristiques et avantages de l'invention apparaîtront au cours de la description qui va suivre, donnée à titre d'exemple non limitatif, en référence aux dessins annexés dans lesquels : la figure 1 est une vue de face d'un premier mode de réalisation d'une banderole selon l'invention ; la figure 2 est vue analogue à la figure 1 d'un deuxième mode de réalisation d'une banderole selon l'invention ; la figure 3 est une vue schématique d'une bande de matière pelli-culaire à partir de laquelle peuvent être découpées des banderoles selon l'invention ; - les figures 4 et 5 sont respectivement une vue de face et une vue de côté d'un emballage alimentaire entouré d'une banderole selon l'invention ; la figure 6 est une vue schématique partielle d'une chaîne de fabrication des emballages représentés aux figures 4 et 5. Sur les différentes figures, on a conservé les mêmes références pour désigner des éléments identiques ou similaires . A la figure 1, est représentée une banderole décorative destinée à entourer la périphérie d'un emballage alimentaire. La banderole 1 est réalisée en un matériau pelliculaire, c'est-à-dire mince et flexible, comme par exemple le papier ou un film en matière plastique, notamment en une matière thermoplastique comme le polypropylène. Le choix d'une matière particulière est déterminé, entre autre, selon les conditions d'utilisation de l'emballage et en fonction du mode de fixation de la banderole à l'emballage. La fixation peut notamment être réalisée par encollage total ou partiel de la banderole, ou par soudage dans le cas où elle est fixée lors du thermoformage du pot de l'emballage. La banderole s'étend longitudinalement sur une longueur 1 entre des extrémités 2. La longueur 1 est déterminée en fonction du périmètre de l'emballage auquel est destinée la banderole. Cette longueur peut être exactement égale au périmètre afin que les extrémités 2 viennent bord à bord, ou légèrement supérieure au périmètre pour avoir un recouvrement des extrémités . Outre les deux extrémités 2, la banderole est délimitée par un premier bord longitudinal 3 et un deuxième bord longitudinal 4. La banderole 1 présente différentes portions contiguës qui s'étendent selon l'axe longitudinal de banderole. Dans le mode de réalisation représenté, ces portions comprennent deux premières portions 10 et 11 qui présentent une largeur maximale Ll. Les portions 10 et 11 sont aussi appelées portions de largeur maximale par la suite. La banderole comporte également deux deuxièmes portions 20 et 21 intercalées entre les premières portions 10 et 11, qui présentent une largeur minimale L2, aussi appelée portion de largeur réduite par la suite. La largeur minimale L2 ou la largeur maximale Ll, peut être atteinte sur tout un segment (12,22) de la portion correspondante, comme cela apparaît sur le mode de réalisation représenté à la figure 1, ou uniquement en un point (12,22) de chaque portion comme cela apparaît sur le mode de réalisation à la figure 2. Les banderoles représentées aux figures 1 et 2 présentent deux portions de largeur maximale (10, 11) et deux portions de largeur réduite (20, 21) , mais le nombre de portions pourrait être différent. Il est notamment possible de prévoir une seule portion de largeur maximale et une seule portion de largeur réduite. Pour atteindre le but de l'invention, la largeur minimale L2 doit être sensiblement inférieure à la largeur maximale Ll ; en effet, les portions de largeur réduite (20, 21) doivent permettre de réduire la surface totale de la banderole par rapport aux banderoles habituellement utilisées qui ont une forme rectangulaire de largeur Ll et de longueur 1. Cette réduction de surface de la banderole entraîne bien entendu une réduction de la matière pelliculaire utilisée, et par conséquent, une réduction du coût de la banderole. Cette réduction de surface réduit également le poids de l'emballage muni de la banderole et limite la surface imprimée, ce qui a une influence positive sur le coût global de fabrication des emballages alimentaires , On considère que pour obtenir une réduction de coût significative, la largeur minimale L2 doit être au plus égale aux deux tiers de la largeur maximale Ll. Toutefois, le rapport entre les largeurs maximale et minimale (L1,L2) peut varier selon l'étendue des segments ou points (12, 22) sur lesquels la largeur maximale et minimale est atteinte, et selon l'économie que l'on cherche à réaliser. Par ailleurs, dans le cas où la banderole présente plusieurs portions de largeur réduite (20, 21), il n'est pas absolument nécessaire que celles-ci atteignent toutes une même largeur minimale L2. Il en est de même pour les portions de largeur maximale (10, 11) . Toutefois, la largeur moyenne des deuxièmes portions (20, 21) doit être inférieure à la largeur moyenne des premières portions (10, 11) . On notera que la conservation de portions de largeur maximale (10, 11) permet l'impression sur la banderole de logos et d'images de taille importante, et de préférence de taille égale à ceux utilisés à ce jour, qui sont bien visibles par le consommateur. La banderole réalisée selon l'invention conserve donc son rôle d'information vis-à-vis des consommateurs. Dans ce but, la largeur maximale Ll est sensiblement égale à la hauteur maximale H de la paroi latérale de l'emballage alimentaire qui sera détaillé ci- après . Comme on peut le voir sur les figures 1 et 2, le premier bord longitudinal 3 de la banderole est rectiligne et parallèle à l'axe longitudinal de celle-ci. Le fait de conserver un bord rectiligne semblable à l'un des bords des banderoles rectangulaires précédemment utilisées, permet de mettre en œuvre les banderoles selon 1 ' invention dans les machines de fabrication connues sans modifications importantes de celles-ci. En effet, le bord rectiligne 3 facilite le guidage des banderoles lors de leur acheminement et facilite leur placement correct par rapport aux pots lors de l'opération de banderolage. Dans le mode de réalisation représenté à la figure 1, le deuxième bord longitudinal 4 est formé de segments longitudinaux (12, 22) reliés par des segments inclinés, de sorte que le deuxième bord 4 a le profil d'une ligne brisée. Mais, le deuxième bord 4 peut avoir le profil d'une ligne ondulée continue, comme on peut le voir sur la figure 2. Cette disposition facilite le découpage du deuxième bords de la banderole, que celui-ci soit réalisé à l'aide de couteaux rotatifs ou à l'aide d'un dispositif laser détaillé ci-après. En effet, le suivi d'une ligne continue par un dispositif de découpage est plus aisé que le suivi d'une ligne présentant des angles prononcés. Le profil du deuxième bord 4 peut être une ligne ondulée sinusoïdale, mais il est possible d'accentuer ou diminuer l'amplitude des ondulations, ou de ne pas les centrer sur les portions de largeur maximale ou réduite, le profil exact de la ligne ondulée pouvant être déterminé pour des raisons esthétiques. Le long des premières portions (10, 11) , le deuxième bord 4 de la banderole présente un profil convexe dont le sommet est défini par le segment ou le point 12. Tandis que le long des portions de largeur réduite (20, 21), le bord deuxième bord 4 de la banderole présente un profil concave dont le creux maximal est atteint au segment ou point 22. Comme cela apparaît plus clairement sur la figure 3, les profils convexes des portions de largeur maximale (10, 11) sont complémentaires aux profils concaves des portions de largeur réduite (20, 21) . On notera que la portion de largeur réduite 20 comprend les extrémités 2 de la banderole, ce qui permet de placer la zone de couvrement ou d'abuttement des extrémités dans une zone moins visible de l'emballage. Toutefois, lorsque la banderole entoure l'emballage, la portion 20 présente un profil concave complémentaire au profil convexe des portions de largeur maximale 10 ou 11. La largeur minimale L2 peut être fortement réduite par rapport à la largeur maximale Ll dans le but de réaliser une économie importante de matière pelliculaire. Toutefois, dans le but de ne pas diminuer trop fortement la résistance à la traction de la banderole, la largeur minimale L2 est au moins égale à un tiers de la largeur maximale Ll. Ainsi, il est possible d'acheminer les banderoles dans les machines connues sans risque de rupture de celles-ci. A titre indicatif, la largeur maximale Ll est de 36 mm et la largeur minimale L2 est de 18 mm, soit la moitié de L2, pour le mode de réalisation de la figure 2. Les banderoles représentées aux figures 1 et 2 peuvent être découpées dans une bande de matière pelliculaire 6 telle que représentée à la figure 3. La bande de matière pelliculaire 6 présente des motifs 7 qui peuvent couvrir plus ou moins complètement la bande 6. La disposition de ces motifs définit le contour des banderoles qui seront découpées dans cette bande. Ces contours sont représentés symboliquement par des lignes continues sur la figure 3, mais il ne s'agit pas de lignes de coupe, ou de pré-découpe, préalablement effectuées sur la bande 6. Les motifs imprimés 7 sont imprimés sur la bande 6 de manière à définir les contours d'un nombre pair de rangées (31, 32, 33, 34, 35, 36) de banderoles disposées côte à côte dans le sens de la largeur de la bande. Les banderoles ainsi définies par les motifs 7, sont agencées de sorte que les deuxièmes bords 4 de deux rangées successives soient adjacents, et de sorte que le premier bord 3 de la première rangée 31 soit contigu au bord longitudinal de la bande 6 et que le premier bord de la dernière rangée 36 soit également contigu à l'autre bord longitudinal de la bande 6. Cette disposition tête-bêche des banderoles avec un décalage longitudinal de deux banderoles adjacentes qui positionne les profils concave et convexe en regard l'un de l'autre, permet d'utiliser toute la matière pelliculaire de la bande 6, sans créer de chutes. Ainsi, et bien que les banderoles selon 1 ' invention présentent un contour plus complexe que les banderoles rectangulaires habituelles, il n'y a pas de perte de matière pelliculaire lors de la fabrication, ce qui permet de réaliser une économie supplémentaire . Aux figures 4 et 5, est représenté un emballage alimentaire 40 de type pot de yaourt qui est entouré d'une banderole 1 réalisée selon l'invention. L'emballage 40 comprend un pot 41 fermé par un opercule arrachable. Le pot 41 en matière thermoplastique est réalisé selon un procédé de thermoformage connu, et comme par exemple décrit dans le document FR-A-2 759 320, qui consiste à préchauffer une feuille de matière thermoplastique puis à emboutir celle-ci dans des moules, une banderole étant préalablement positionnée contre la paroi latérale desdits moules. Pour réaliser des emballages alimentaires, cette opération de formage du pot est généralement suivie d'une opération de remplissage avec le produit alimentaire, immédiatement suivie d'une opération de fermeture par un opercule. Ce procédé est réalisé par une machine de production FFS pour Formage, Remplissage, Fermeture (Form, Fill, Seal en anglais) . Ce type d'emballage 40 auxquel est destinée la banderole, a une contenance généralement comprise entre 10 et 500 ml, et par exemple d'environ 200 ml comme dans le mode de réalisation représenté. Le pot 41 présente un fond 43 qui, dans le mode de réalisation représenté, remonte assez largement vers la paroi latérale 44. Mais bien entendu, le pot pourrait, présenter une forme cylindrique, et dans ce cas, le fond 43 serait formé uniquement par le disque inférieur du cylindre. La paroi latérale 44 est annulaire et s'étend verticalement jusqu'à un collet radialement extérieur qui entoure l'ouverture du pot. Un opercule est ajusté sur le collet du pot de manière à former la face supérieure 42 de 1 ' emballage. Comme cela ressort des figures 4 et 5 représentant respectivement une vue de face et une vue de côté de l'emballage 40, la section transversale de l'emballage a globalement la forme d'un rectangle à coins arrondis. Dans ce mode de réalisation où le fond 43 remonte plus ou moins, la paroi latérale 44 présente une hauteur maximale H au centre du grand côté de l'emballage. Mais dans le cas d'un pot cylindrique, la hauteur H de l'emballage serait égale à la hauteur de cylindre. La portion de largeur maximale 10 de la banderole 1 est agencée sur le grand côté de l'emballage, comme on peut le voir sur la figure 4, et la largeur maximale L2 est sensiblement égale à la hauteur H. Aussi, le motif 7 de la banderole est suffisamment étendu pour conserver le rôle d'information et de décoration de la banderole. Bien entendu, la largeur Ll de la banderole peut être inférieure de quelques millimètres à la hauteur H du pot tout en conservant les qualités visuelles de la banderole ; à titre d'exemple, dans le mode de réalisation représenté, la hauteur H est de 38 mm et la largeur L2 est de 36 mm. Pour réaliser des banderoles selon l'invention, on peut mettre en œuvre un procédé comprenant une étape de découpage des bords longitudinaux des banderoles suivi d'une étape de découpage des extrémités des banderoles. Toutefois, il est parfaitement possible de découper des banderoles en une seule étape, notamment à l'aide d'une matrice présentant un bord tranchant selon le contour de la banderole. Lors de l'étape de découpage des bords longitudinaux, il est avantageux qu'au moins le découpage du deuxième bord 4 soit effectué par un dispositif laser comprenant un faisceau laser mobile dont les mouvements sont commandés de manière à suivre les profils concave et convexe de ce deuxième bord. Le laser peut être de tous types connus et adaptés à découper une feuille de papier ou un film de matière plastique. De manière connue, le dispositif laser peut produire un faisceau, ou plusieurs faisceaux de découpage comme dans le cas du dispositif 50 représenté à la figure 6. Les mouvements du ou des faisceaux sont créés par des servomoteurs agissant par exemple sur des miroirs. Les servomoteurs sont eux-mêmes commandés par un dispositif de commande 51 qui contient un ou plusieurs programmes d'asservissement des servomoteurs afin que les faisceaux laser effectuent un ou plusieurs tracés de découpe. L'utilisation d'un dispositif laser permet donc de découper le deuxième bord longitudinal 4 des banderoles selon un tracé complexe et offre la possibilité de passer quasiment instantanément de la production d'une première forme de banderole à une deuxième forme de banderole, par simple entrée d'un code dans le dispositif de commande 51. De plus, un dispositif laser présente l'avantage par rapport à un dispositif à couteaux tournants ou à matrices tranchantes, de ne pas subir de phénomènes d'usure, ni de phénomènes d' encrassage, ce qui est particulièrement important dans le domaine de l'emballage alimentaire. Bien entendu, les bords rectilignes peuvent également être découpés par un faisceau laser. La découpe des banderoles par le dispositif de découpage laser est de préférence effectuée dans une bande de matière pelliculaire telle que décrite précédemment. Comme on peut le voir à la figure 6, la bande 6, stockée sous forme de rouleau, est dévidée de manière à défiler par rapport au dispositif de découpage laser 50 disposé transversalement par rapport au sens de défilement. Du fait de ce mouvement de la bande 6 par rapport au dispositif 50, il est possible de ne commander le déplacement des faisceaux que selon une direction transversale à la bande, ce qui évite d'avoir à commander un mouvement supplémentaire selon le sens longitudinal des banderoles. Un dispositif 52 adapté pour détecter le mouvement de la bande 6, est relié au dispositif de commande 51 afin de synchroniser les mouvements des faisceaux laser avec le défilement de la bande. Le dispositif 52 peut être un dispositif de reconnaissance optique des motifs imprimés sur la bande ou de tout autre marquage apposé sur celle-ci. Le découpage des bandes est intégré à la machine de fabrication des pots d'emballage 41. Il s'agit d'une machine de type FFS incluant un poste de thermoformage qui comprend des moules représentés de manière symbolique par la référence 55. L'étape de découpage des bords longitudinaux est suivie d'une étape d'acheminement des bandelettes 31, 36 correspondant aux rangées de la bande 6 qui ont été découpées longitudinalement. Cette étape d'acheminement est effectuée à l'aide de poulies et de renvois 57 de types connus, et ne nécessite pas de modifications importantes grâce au premier bord rectiligne 3 qui facilite le guidage des bandelettes. On notera qu'au cours de l'acheminement des banderoles, les rangées paires (32, 34, 36) subisse une rotation inversée par rapport aux rangées impaires (31, 33, 35) pour arriver aux postes de moulage avec la même orientation verticale. Une fois acheminées au niveau des moules 55, les banderoles sont introduites dans ceux-ci avant le thermoformage des pots et coupées transversalement à l'aide d'un système à couteaux tranchants connu pour former les extrémités des banderoles. Dans le mode de réalisation représenté, il s'agit d'une machine permettant de réaliser six pots simultanément, mais bien entendu, il pourrait s'agir d'une machine permettant de réaliser douze ou vingt-quatre pots à la fois. The present invention relates to a decorative streamer intended to surround the periphery of a food package. BACKGROUND OF THE INVENTION More particularly, the package comprises a lateral annular wall extending between a bottom and an upper face, while the streamer extends longitudinally between two ends and has a first and a second longitudinal edge. This type of banner generally includes a logo representing the brand of the product, and possibly an image evoking the content and indications on the composition of the product. These streamers are intended to surround the periphery of the side wall of the package so that the ends of the streamer overlap, or they come edge to edge. The fact that the banner completely surrounds the packaging satisfies aesthetic criteria, but also improves the behavior of the banner on the packaging compared to the labels, and avoids its tearing. Decorative streamers are very commonly used for packages containing dairy products, for example yogurt or butter, but also products such as fruit compotes and margarine. The upper face of the package is provided with an opening that can be closed by a tear-off lid in the case of yoghurt-type packaging, or by a removable lid as is most often used for packaging intended to contain margarine. The pot which forms the bottom, the side wall, and possibly part of the upper face of the package, is generally made by thermoforming a sheet of plastic material in a mold. This manufacturing process makes it possible to produce particularly inexpensive packaging in very large quantities while respecting the hygiene standards necessary for food products. To date, the decorative streamers have an elongated rectangular shape, that is to say that they have first and second longitudinal edges rectilinear and parallel. They are usually cut from a strip of film material such as paper or plastic film, which is printed and stored as a roll before the streamers are cut. Food packaging of this type is produced in very large quantities and intended for highly competitive markets. It is therefore important to minimize the unit cost of each package without degrading its strength and aesthetic characteristics. The present invention therefore aims to reduce the unit cost of these packages dressed with a decorative streamer. For this purpose, the decorative streamer of the aforementioned type is characterized in that it has at least a first longitudinally extending portion having a maximum width, and at least a second portion having a minimum width, said minimum width being at least plus two-thirds of the maximum width. With this arrangement, the amount of film material, whether paper or plastic film used to make the streamer is less important than that used to make a rectangular streamer having a width equal to the maximum width, reduction of material which of course makes it possible to reduce the cost of the streamer. This reduction of matter also reduces the weight of the packaging, which has a favorable influence on the transport and recycling of packaging. The fact that the surface of the streamer is reduced also makes it possible to reduce the surface of the printed decorations and consequently to save ink. Furthermore, the streamer thus produced can still completely surround the package to maintain a good quality of attachment thereof, and be used in the present application processes of the banner on the packaging used. In preferred embodiments of the streamer, one or more of the following arrangements may be used: the first longitudinal edge is rectilinear and substantially parallel to the longitudinal axis of the streamer, this first straight edge then allowing to guide the streamer in commonly used routing devices and without significant modification thereof; the second edge has a convex profile along the first portion and a concave profile along the second portion, said convex profile being complementary to said concave profile, to produce in a film material the second edges of a first and a second streamer by performing a single line of cut; the second edge has the profile of a continuous wavy line; - the minimum width is at least one third of the maximum width, to maintain a tensile strength that prevents the breaking of the banner during its routing during the manufacturing cycle; the maximum width is substantially equal to the maximum height of the side wall of the package food. The streamer defined above can be made from a strip of film material having patterns which define, in the width of the strip, the contour of an even number of rows of said streamers which are arranged so that the second edges of the streamers of two successive rows are adjacent, and so that the first edge of the first row and the first edge of the last row are contiguous to the longitudinal edges of the band, so as to have no drop in the band after cutting the streamers. A food package having a lateral annular wall extending between a bottom and an upper face, is advantageously surrounded on the periphery of the side wall by a decorative streamer as defined above, in order to reduce the overall cost of this package. In the case where the annular side wall of such a package has a cross section which generally has the shape of a rounded corner rectangle, the first portion of maximum width of the streamer is arranged on a large side of the side wall of packaging, so that this portion of the streamer is clearly visible. In a method of manufacturing the streamer defined above, which comprises a step of cutting the longitudinal edges of the streamers, one or both of the following arrangements may be used: at least the cutting of the streamer second edge of the streamers is performed by a device comprising at least one mobile laser beam which makes it possible to produce varied and relatively complex cutting lines; the cutting of the longitudinal edges of the streamers is carried out in a band of pellicular material as defined above, which passes by relative to the laser cutting device, the movements of the laser beam being synchronized with the scrolling of the strip. In a packaging manufacturing process provided with a streamer according to the invention, and which comprises a step of thermoforming the packages in molds, it is advantageous to include a step of cutting the longitudinal edges from a strip as defined above, followed by a step of feeding the strips thus obtained to the mold, and a step of cutting the ends of the streamers which is performed near the molds. Other features and advantages of the invention will become apparent from the following description, given by way of non-limiting example, with reference to the accompanying drawings, in which: FIG. 1 is a front view of a first embodiment. embodiment of a streamer according to the invention; FIG. 2 is a view similar to FIG. 1 of a second embodiment of a streamer according to the invention; FIG. 3 is a diagrammatic view of a strip of pelli-cular material from which streamers according to the invention can be cut; - Figures 4 and 5 are respectively a front view and a side view of a food package surrounded by a streamer according to the invention; FIG. 6 is a partial schematic view of a production line of the packages represented in FIGS. 4 and 5. In the various figures, the same references have been retained to designate identical or similar elements. In Figure 1, there is shown a decorative streamer intended to surround the periphery of a package food. The streamer 1 is made of a film material, that is to say thin and flexible, such as paper or a plastic film, in particular a thermoplastic material such as polypropylene. The choice of a particular material is determined, among other things, according to the conditions of use of the packaging and according to the method of attachment of the streamer to the package. Fixing may in particular be carried out by total or partial sizing of the streamer, or by welding in the case where it is fixed during thermoforming of the pot of the package. The streamer extends longitudinally along a length 1 between ends 2. The length 1 is determined according to the perimeter of the package for which the streamer is intended. This length can be exactly equal to the perimeter so that the ends 2 come edge to edge, or slightly greater than the perimeter to have an overlap of the ends. In addition to the two ends 2, the streamer is delimited by a first longitudinal edge 3 and a second longitudinal edge 4. The streamer 1 has different contiguous portions which extend along the longitudinal axis of the streamer. In the embodiment shown, these portions comprise two first portions 10 and 11 which have a maximum width L1. Portions 10 and 11 are also referred to as maximum width portions thereafter. The streamer also comprises two second portions 20 and 21 interposed between the first portions 10 and 11, which have a minimum width L2, also called reduced width portion thereafter. The minimum width L2 or the maximum width L1 can be reached over a whole segment (12,22) of the corresponding portion, as shown in the embodiment shown in FIG. 1, or only in one point (12,22) of each portion as shown in the embodiment in Figure 2. The streamers shown in Figures 1 and 2 have two portions of maximum width (10, 11) and two portions of reduced width (20, 21), but the number of portions could be different. In particular, it is possible to provide a single portion of maximum width and a single portion of reduced width. To achieve the object of the invention, the minimum width L2 must be substantially smaller than the maximum width L1; in fact, the portions of reduced width (20, 21) must make it possible to reduce the total area of the streamer relative to the streamers usually used, which have a rectangular shape of width L1 and length 1. This reduction in the area of the streamer causes of course a reduction in the film material used, and therefore a reduction in the cost of the streamer. This reduction in surface area also reduces the weight of the packaging provided with the banner and limits the printed area, which has a positive influence on the overall cost of manufacturing food packaging. It is considered that to obtain a significant cost reduction, the minimum width L2 shall be not more than two-thirds of the maximum width L1. However, the ratio between the maximum and minimum widths (L1, L2) may vary depending on the extent of the segments or points (12, 22) over which the maximum and minimum width is reached, and depending on the economy that is sought to achieve. Furthermore, in the case where the streamer has several portions of reduced width (20, 21), it is not absolutely necessary that they all reach the same minimum width L2. It is the same for the portions of maximum width (10, 11). However, the average width of the second portions (20, 21) must be less than the average width of the first portions (10, 11). It will be noted that the retention of portions of maximum width (10, 11) allows the printing on the banner of logos and images of significant size, and preferably of size equal to those used to date, which are clearly visible by the consumer. The streamer made according to the invention retains its role of information vis-à-vis consumers. For this purpose, the maximum width L1 is substantially equal to the maximum height H of the side wall of the food package which will be detailed below. As can be seen in Figures 1 and 2, the first longitudinal edge 3 of the streamer is rectilinear and parallel to the longitudinal axis thereof. Keeping a rectilinear edge similar to one of the edges of the previously used rectangular streamers makes it possible to implement streamers according to the invention in known manufacturing machines without major modifications thereof. Indeed, the rectilinear edge 3 facilitates the guidance of the streamers during their routing and facilitates their correct placement relative to the pots during the wrapping operation. In the embodiment shown in Figure 1, the second longitudinal edge 4 is formed of longitudinal segments (12, 22) connected by inclined segments, so that the second edge 4 has the profile of a broken line. But, the second edge 4 can have the profile of a continuous corrugated line, as can be seen in FIG. 2. This arrangement facilitates the cutting of the second edges of the streamer, which is made using rotary knives or with a laser device detailed below. Indeed, the follow-up of a continuous line by a cutting device is easier than following a line with sharp angles. The profile of the second edge 4 may be a sinusoidal wavy line, but it is possible to accentuate or reduce the amplitude of the corrugations, or not to center them on the portions of maximum or reduced width, the exact profile of the corrugated line. which can be determined for aesthetic reasons. Along the first portions (10, 11), the second edge 4 of the streamer has a convex profile whose apex is defined by the segment or the point 12. While along the portions of reduced width (20, 21), the edge of the second edge 4 of the streamer has a concave profile whose maximum hollow is reached at the segment or point 22. As is more clearly apparent in FIG. 3, the convex profiles of the portions of maximum width (10, 11) are complementary to the concave profiles of the reduced width portions (20, 21). Note that the portion of reduced width 20 comprises the ends 2 of the streamer, which allows to place the area of cover or abutment ends in a less visible area of the package. However, when the streamer surrounds the package, the portion 20 has a concave profile complementary to the convex profile portions of maximum width 10 or 11. The minimum width L2 can be greatly reduced compared to the maximum width L1 in order to achieve a significant saving of pellicular material. However, in order not to decrease too much the tensile strength of the streamer, the minimum width L2 is at least equal to one third of the maximum width L1. Thus, it is possible to route the streamers in known machines without risk of breaking them. As an indication, the maximum width L1 is 36 mm and the minimum width L2 is 18 mm, ie half of L2, for the embodiment of FIG. The streamers shown in FIGS. 1 and 2 may be cut out of a strip of film material 6 as shown in FIG. 3. The strip of film material 6 has patterns 7 which may cover the strip more or less completely. these patterns define the outline of the streamers that will be cut out in this band. These contours are represented symbolically by continuous lines in FIG. 3, but these are not cutting lines or pre-cuts previously made on the strip 6. The printed patterns 7 are printed on the strip 6 of FIG. in order to define the contours of an even number of rows (31, 32, 33, 34, 35, 36) of streamers arranged side by side in the width direction of the strip. The streamers thus defined by the patterns 7, are arranged so that the second edges 4 of two successive rows are adjacent, and so that the first edge 3 of the first row 31 is contiguous to the longitudinal edge of the strip 6 and that the first edge of the last row 36 is also contiguous with the other longitudinal edge of the strip 6. This arrangement head-to-toe of the streamers with a longitudinal offset of two adjacent streamers which positions the concave and convex profiles facing one of the other, allows to use all the film material of the strip 6, without creating falls. Thus, and although the streamers according to the invention have a more complex contour than the usual rectangular streamers, there is no loss of film material during manufacture, which allows for additional savings. In Figures 4 and 5, there is shown a food packaging 40 yogurt pot type which is surrounded by a streamer 1 made according to the invention. The package 40 comprises a pot 41 closed by a tear-off operculum. The pot 41 of thermoplastic material is produced according to a known thermoforming process, and as for example described in document FR-A-2 759 320, which consists of preheating a sheet of thermoplastic material and then stamping it into molds, a streamer being previously positioned against the side wall of said molds. To produce food packaging, this operation of forming the pot is generally followed by a filling operation with the food product, immediately followed by a closure operation by a lid. This process is carried out by an FFS production machine for Forming, Filling, Closing (Form, Fill, Seal). This type of packaging 40 for which is intended the streamer, has a capacity generally between 10 and 500 ml, and for example about 200 ml as in the embodiment shown. The pot 41 has a bottom 43 which, in the embodiment shown, rises quite widely towards the side wall 44. But of course, the pot could have a cylindrical shape, and in this case, the bottom 43 would be formed solely by the lower disk of the cylinder. The side wall 44 is annular and extends vertically to a radially outer collar that surrounds the opening of the pot. A cap is fitted on the neck of the pot so as to form the upper face 42 of the package. As is apparent from Figures 4 and 5 respectively showing a front view and a side view of the package 40, the cross section of the package has generally the shape of a rectangle with rounded corners. In this embodiment where the bottom 43 rises more or less, the side wall 44 has a maximum height H in the center of the long side of the package. But in the case of a cylindrical pot, the height H of the package would be equal to the cylinder height. The portion of maximum width 10 of the streamer 1 is arranged on the long side of the package, as can be seen in FIG. 4, and the maximum width L 2 is substantially equal to the height H. Also, the pattern 7 of the banner is large enough to retain the role of information and decoration of the banner. Of course, the width L1 of the streamer may be a few millimeters lower than the height H of the pot while maintaining the visual qualities of the streamer; for example, in the embodiment shown, the height H is 38 mm and the width L2 is 36 mm. To produce streamers according to the invention, it is possible to implement a method comprising a step of cutting the longitudinal edges of the streamers followed by a step of cutting the ends of the streamers. However, it is perfectly possible to cut streamers in a single step, including using a matrix having a sharp edge along the outline of the streamer. During the step of cutting the longitudinal edges, it is advantageous that at least the cutting of the second edge 4 is performed by a laser device comprising a mobile laser beam whose movements are controlled so as to follow the concave and convex profiles of this second edge. The laser can be of all types known and adapted to cut a sheet of paper or a plastic film. In known manner, the laser device can produce a beam, or several clipping beams as in the case of the device 50 shown in Figure 6. The movements of the beam or beams are created by servomotors acting for example on mirrors. The servomotors are themselves controlled by a device of control 51 which contains one or more servo servo programs so that the laser beams perform one or more cutting lines. The use of a laser device thus makes it possible to cut the second longitudinal edge 4 of the streamers in a complex pattern and offers the possibility of passing almost instantaneously from the production of a first form of streamer to a second form of streamer, simply by addition of a code in the control device 51. In addition, a laser device has the advantage over a device with rotating knives or cutting dies, not to undergo wear phenomena, or phenomena of fouling, which is particularly important in the field of food packaging. Of course, the rectilinear edges can also be cut by a laser beam. The cutting of the streamers by the laser cutting device is preferably carried out in a strip of film material as described above. As can be seen in Figure 6, the strip 6, stored in the form of a roll, is unwound so as to scroll relative to the laser cutting device 50 disposed transversely relative to the direction of travel. Due to this movement of the strip 6 relative to the device 50, it is possible to control the displacement of the beams only in a direction transverse to the strip, which avoids having to control an additional movement in the longitudinal direction of the banners. A device 52 adapted to detect the movement of the strip 6 is connected to the control device 51 in order to synchronize the movements of the laser beams with the scrolling of the strip. The device 52 may be an optical recognition device for the printed patterns on the tape or any other marking affixed to it. The cutting of the strips is integrated in the machine for manufacturing the packaging pots 41. It is a machine of the FFS type including a thermoforming station which comprises molds represented symbolically by the reference 55. The step cutting of the longitudinal edges is followed by a step of routing the strips 31, 36 corresponding to the rows of the strip 6 which have been cut longitudinally. This routing step is performed using pulleys and references 57 of known types, and does not require significant changes with the first straight edge 3 which facilitates the guiding of the strips. It will be noted that during the routing of the streamers, the even rows (32, 34, 36) undergo reverse rotation relative to the odd rows (31, 33, 35) to arrive at the molding stations with the same vertical orientation . Once transported to the level of the molds 55, the streamers are introduced into them before thermoforming the pots and cut transversely using a cutting knife system known to form the ends of the streamers. In the embodiment shown, it is a machine for making six pots simultaneously, but of course, it could be a machine to achieve twelve or twenty-four pots at a time.

Claims

REVENDICATIONS
1. Banderole décorative destinée à entourer la périphérie d'un emballage alimentaire (40) qui comprend une paroi annulaire latérale (44) s'étendant entre un fond (43) et une face supérieure (42), ladite banderole s'étendant longitudinalement entre deux extrémités (2) et présentant un premier et un deuxième bords longitudinaux (3,4), caractérisée en ce qu'elle présente au moins une première portion (10,11) s'étendant longitudinalement qui présente une largueur maximale Ll, et au moins une deuxième portion (20,21) qui présente une largeur minimale L2, ladite largueur minimale L2 étant au plus égale au deux tiers de la largueur maximale Ll. A decorative banner for surrounding the periphery of a food package (40) which includes a lateral annular wall (44) extending between a bottom (43) and an upper face (42), said streamer extending longitudinally between two ends (2) and having first and second longitudinal edges (3,4), characterized in that it has at least a first portion (10,11) extending longitudinally which has a maximum width L1, and at at least a second portion (20,21) having a minimum width L2, said minimum width L2 being at most equal to two thirds of the maximum width L1.
2. Banderole selon la revendication 1, dans laquelle le premier bord (3) est rectiligne et sensiblement parallèle à l'axe longitudinal de la banderole. 2. Banner according to claim 1, wherein the first edge (3) is rectilinear and substantially parallel to the longitudinal axis of the streamer.
3. Banderole selon la revendication 1 ou 2, dans laquelle le deuxième bord (4) présente un profil convexe le long de la première portion (10,11) et un profil concave le long de la deuxième portion (20,21), ledit profil convexe étant complémentaire audit profil concave. 3. Banner according to claim 1 or 2, wherein the second edge (4) has a convex profile along the first portion (10,11) and a concave profile along the second portion (20,21), said convex profile being complementary to said concave profile.
4. Banderole selon l'une quelconque des revendications 1 à 3, dans laquelle le deuxième bord (4) a le profil d'une ligne ondulée continue. 4. Banner according to any one of claims 1 to 3, wherein the second edge (4) has the profile of a continuous corrugated line.
5. Banderole, selon l'une quelconque des revendication 1 à 4, dans laquelle la largeur minimale L2 est au moins égale à un tiers de la largeur maximale Ll. A streamer as claimed in any one of claims 1 to 4, wherein the minimum width L 2 is at least one-third of the maximum width L1.
6. Banderole, selon l'une quelconque des revendication 1 à 5, dans laquelle la largeur maximale Ll est sensiblement égale à la hauteur maximale H de la paroi latérale (44) de l'emballage alimentaire (40). 6. Banner according to any one of claims 1 to 5, wherein the maximum width L1 is substantially equal to the maximum height H of the side wall (44) of the food package (40).
7. Bande de matière pelliculaire comportant des motifs imprimés (7), caractérisée en ce que les motifs imprimés définissent, dans le sens de la largeur de la bande (6), le contour d'un nombre pair de rangées (31,32,33,34,35,36) de banderoles selon l'une quelconque des revendications 3 à 6, les lesdites banderoles (1) étant agencées de sorte que les deuxièmes bords (4) des banderoles de deux rangées successives soient adjacents et de sorte que le premier bord (3) de la première rangée (31) et le premier bord la dernière rangée (36) soient contigus aux bords longitudinaux de la bande (6) . 7. Strip of film material with printed patterns (7), characterized in that the patterns in the width direction of the strip (6), define the outline of an even number of rows (31,32,33,34,35,36) of streamers according to any one of claims 3 to 6 , said streamers (1) being arranged so that the second edges (4) of the streamers of two successive rows are adjacent and so that the first edge (3) of the first row (31) and the first edge the last row (36) are contiguous to the longitudinal edges of the strip (6).
8. Emballage alimentaire présentant une paroi annulaire latérale (40) s'étendant entre un fond (43) et une face supérieure (42), caractérisé en ce que la périphérie de la paroi latérale est entourée d'une banderole décorative selon l'une quelconque des revendications 1 à 6. 8. Food packaging having a lateral annular wall (40) extending between a bottom (43) and an upper face (42), characterized in that the periphery of the side wall is surrounded by a decorative streamer according to one any of claims 1 to 6.
9. Emballage alimentaire selon la revendication 8, dans lequel la paroi latérale annulaire (44) à une section transversale qui présente globalement la forme d'un rectangle à coins arrondis, et dans lequel au moins une première portion (10) de largueur maximale Ll est agencée sur un grand côté de la paroi latérale de l'emballage. The food package of claim 8, wherein the annular sidewall (44) has a cross-section that generally has the shape of a rounded-corner rectangle, and wherein at least a first portion (10) of maximum width L1. is arranged on a large side of the side wall of the package.
10. Procédé de fabrication de banderoles selon l'une quelconque des revendications 1 à 6, caractérisé en ce qu'il comprend une étape de découpage des bords longitudinaux (3,4) des banderoles, dans laquelle au moins le découpage du deuxième bords (4) des banderoles est effectué par dispositif (50) comprenant au moins un faisceau laser mobile. 10. A method of manufacturing streamers according to any one of claims 1 to 6, characterized in that it comprises a step of cutting the longitudinal edges (3,4) of the streamers, wherein at least the cutting of the second edges ( 4) streamers is performed by device (50) comprising at least one mobile laser beam.
11. Procédé de fabrication de banderoles selon la revendication 10, dans lequel l'étape de découpage des bords longitudinaux est effectuée dans une bande de matière pelliculaire (6) selon la revendication 6 qui défile par rapport au dispositif de découpage laser (50), les mouvements du faisceau laser étant synchronisés avec le défilement de la bande. A method of making streamers according to claim 10, wherein the step of cutting the longitudinal edges is performed in a strip of film material (6) according to claim 6 which scrolls with respect to the laser cutting device (50), the movements of the laser beam being synchronized with the scrolling of the strip.
12. Procédé de fabrication d'emballages alimentaires selon la revendication 8 ou 9, et comprenant une étape de thermoformage des emballages (40) dans des moules (55), caractérisé en ce qu'il comprend une étape de découpages des bords longitudinaux des banderoles selon la revendication 11, suivie d'une étape d'amenée des bandelettes ainsi obtenues jusqu'aux moules, et d'une étape de découpage des extrémités (2) des banderoles qui est effectuée à proximité des moules. 12. A method of manufacturing food packaging according to claim 8 or 9, and comprising a step of thermoforming the packages (40) in molds (55), characterized in that it comprises a step of cutting the longitudinal edges of the streamers. according to claim 11, followed by a step of feeding the strips thus obtained to the molds, and a step of cutting the ends (2) of the streamers which is carried out near the molds.
PCT/FR2004/002698 2003-11-03 2004-10-21 Decorative band, food packaging comprising one such band and production method thereof WO2005047130A1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
EP04805262A EP1680331B1 (en) 2003-11-03 2004-10-21 Decorative band, food packaging comprising one such band and production method thereof
PL04805262T PL1680331T3 (en) 2003-11-03 2004-10-21 Decorative band, food packaging comprising one such band and production method thereof
DE602004016546T DE602004016546D1 (en) 2003-11-03 2004-10-21 Decorative band, such a band comprehensive food packaging and method of manufacturing thereof
US10/577,724 US20070134381A1 (en) 2003-11-03 2004-10-21 Decorative band, food packaging comprising one such band and production method thereof
DK04805262T DK1680331T3 (en) 2003-11-03 2004-10-21 Decoration ribbons, food packaging comprising such a ribbon and method of manufacture thereof
SI200430898T SI1680331T1 (en) 2003-11-03 2004-10-21 Decorative band, food packaging comprising one such band and production method thereof
US14/300,252 US20140284240A1 (en) 2003-11-03 2014-06-10 Decorative band, food packaging comprising one such band and production method thereof

Applications Claiming Priority (2)

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FR0312863 2003-11-03
FR0312863A FR2861694B1 (en) 2003-11-03 2003-11-03 DECORATIVE BANNER, FOOD PACKAGE COMPRISING SUCH A BANDEROLE AND METHOD OF MANUFACTURE

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US10/577,724 A-371-Of-International US20070134381A1 (en) 2003-11-03 2004-10-21 Decorative band, food packaging comprising one such band and production method thereof
US14/300,252 Division US20140284240A1 (en) 2003-11-03 2014-06-10 Decorative band, food packaging comprising one such band and production method thereof

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CZ2012275A3 (en) * 2012-04-19 2013-12-11 Plasgura@Richard Process for producing labels of edible paper for identification of food products and apparatus for making the same
CN110549413A (en) * 2019-07-10 2019-12-10 杭州中亚机械股份有限公司 Decorative strip production method
CN110549412A (en) * 2019-07-10 2019-12-10 杭州中亚机械股份有限公司 Decorative strip production method
CN110421641A (en) * 2019-07-10 2019-11-08 杭州中亚机械股份有限公司 A kind of ornamental strip Supply Method

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FR2861694A1 (en) 2005-05-06
PT1680331E (en) 2008-12-18
DE602004016546D1 (en) 2008-10-23
ATE407885T1 (en) 2008-09-15
EP1680331A1 (en) 2006-07-19
FR2861694B1 (en) 2006-01-27
US20070134668A1 (en) 2007-06-14
SI1680331T1 (en) 2009-02-28
US20140284240A1 (en) 2014-09-25
EP1680331B1 (en) 2008-09-10
ES2313114T3 (en) 2009-03-01
DK1680331T3 (en) 2009-01-26
US20070134381A1 (en) 2007-06-14
PL1680331T3 (en) 2009-03-31

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